One of the best ways of limiting the effects of interference is by using directional antennas, if you are using the stock antenna you are covering 360 on the horizontal and almost as much on the vertical (rubber duckie pointing up... ) if you need coverage in a certain area buy a directional and put the AP in a corner.
Another thing you can do is try the different channels, 1-6-11 are the furthest from each other (still overlapping) but if the interfering devices are transmitting on those same center frequencies, using channel 3-4 or 8-9 might give you a bit of space to work. Try and lock the AP transmit to only use 1Mbit/6Mbit (really you should lock it to only talk to 802.11g clients, unless there is a real need for compatibility) the radios works by giving a higher datarate but lowering the power output, so by locking to 6Mbit/s u are almost guaranteed to get the most powerful EIRP (4Watts) allowed under FCC. Maybe the open source FW can push beyond that, but that's generally a bad idea. MM -----Original Message----- From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of Victor Caballero Sent: Thursday, April 17, 2008 11:14 PM To: [email protected] Subject: [SOCALWUG] Re: WIFI Interference Thanks Martin. Appreciate the quick response. I am using a Linksys 802.11b/g router with dd-wrt firmware, but have tried a Airlink and Dlink with similar results. I am suspicious that since the AP works in other parts of the facility that there is something causing the interference. Perhaps some audio/digital equipment, wireless mics, etc... Are there way to provide internet access to clients when the environment has interference factors? Regards, Victor -----Original Message----- From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of Martin Madsen Sent: Thursday, April 17, 2008 11:07 PM To: [email protected] Subject: [SOCALWUG] Re: WIFI Interference Sounds like multi path. What standard is the AP using (802.11...)? if you have metal surfaces (mirrors?) in between they don't just attenuate the signal they bounce it around. So best case you get a low signal, worst case you get dead zones and other zones with super high signal... but no data throughput, because the signal is comprised of multiple signals transmitted at different times (carrying different data, but matching phase) 802.11g+a uses OFDM Modulation, which alleviates some of the problems with multipath. 802.11 and 802.11b uses CCK and Barker coding for the modulation which does next to nothing to help MP issues. MM -----Original Message----- From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of Victor Caballero Sent: Thursday, April 17, 2008 10:33 PM To: [email protected] Subject: [SOCALWUG] WIFI Interference Hello, Has anyone experienced a situation where you move an access point to an area and it just disappears or fades in and out. Any suggestions? I tried changing the channel and that didn't help. This is driving me crazy. Any help appreciated. Thanks, Victor --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "SOCALWUG" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/SOCALWUG SOCALWUG website: http://www.socalwug.org -~----------~----~----~----~------~----~------~--~---
